/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: warning: variable 'z' set but not used [-Wunused-but-set-variable]
  int n,m=0,i,j,z=0,s=0,l,g=1;
                ^
/in/foo.cc:8:26: warning: unused variable 'g' [-Wunused-variable]
  int n,m=0,i,j,z=0,s=0,l,g=1;
                          ^
/in/foo.cc:39:7: warning: iteration 10000 invokes undefined behavior [-Waggressive-loop-optimizations]
   c[i]=30001;
   ~~~~^~~~~~
/in/foo.cc:37:11: note: within this loop
  for(i=1;i<=10001;i++)
          ~^~~~~~~
/in/foo.cc:53:7: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized]
   c[l]=a[i];
   ~~~~^~~~~